I’d forget about those measurements you’re doing & just measure the springs themselves to determine how much lift over stock you have, I think stock is 8 rear/12 front but someone will correct that if it’s wrong.
You’ve got a few things going on there besides the lack of details as to what you have and/or how old it may be. Add to that a heavier than stock front bumper weighed down more by the winch, together you’re probably 100lbs or more over stock on those front springs. Combine that with the factory rake & it’s certainly making your nose dip a good bit.
If leveling it out is what you’re after you can do what most do & put spacers up front as you’re considering, or you can put a one inch taller spring up front. Springs by & large are relatively inexpensive so I’d be considering replacing them all anyway, shocks too while you’re at it, to start with a clean slate.